/* ---------- * numeric.h * *	Definitions for the exact numeric data type of Postgres * *	1998 Jan Wieck * * $Header: /usr/local/cvsroot/pgsql/src/include/utils/numeric.h,v 1.6.2.1 1999/08/02 05:25:26 scrappy Exp $ * * ---------- */#ifndef _PG_NUMERIC_H_#define _PG_NUMERIC_H_/* ---------- * The hardcoded limits and defaults of the numeric data type * ---------- */#define NUMERIC_MAX_PRECISION		1000#define NUMERIC_DEFAULT_PRECISION	30#define NUMERIC_DEFAULT_SCALE		6#define NUMERIC_MAX_DISPLAY_SCALE	NUMERIC_MAX_PRECISION#define NUMERIC_MIN_DISPLAY_SCALE	NUMERIC_DEFAULT_SCALE + 4#define NUMERIC_MAX_RESULT_SCALE	(NUMERIC_MAX_PRECISION * 2)#define NUMERIC_MIN_RESULT_SCALE	(NUMERIC_DEFAULT_PRECISION + 4)#define NUMERIC_UNPACKED_DATASIZE	(NUMERIC_MAX_PRECISION * 2 + 4)/* ---------- * Sign values and macros to deal with n_sign_dscale * ---------- */#define NUMERIC_SIGN_MASK	0xC000#define NUMERIC_POS			0x0000#define NUMERIC_NEG			0x4000#define NUMERIC_NAN			0xC000#define NUMERIC_SIGN(n)		((n)->n_sign_dscale & NUMERIC_SIGN_MASK)#define NUMERIC_DSCALE(n)	((n)->n_sign_dscale & ~NUMERIC_SIGN_MASK)#define NUMERIC_IS_NAN(n)	(NUMERIC_SIGN(n) != NUMERIC_POS &&			\								NUMERIC_SIGN(n) != NUMERIC_NEG)/* ---------- * The Numeric data type stored in the database * ---------- */typedef struct NumericData{	int32		varlen;			/* Variable size		*/	int16		n_weight;		/* Weight of 1st digit	*/	uint16		n_rscale;		/* Result scale			*/	uint16		n_sign_dscale;	/* Sign + display scale */	unsigned char n_data[1];	/* Digit data			*/} NumericData;typedef NumericData *Numeric;#define NUMERIC_HDRSZ	(sizeof(int32) + sizeof(uint16) * 3)#endif	 /* _PG_NUMERIC_H_ */